(c) Initial cuff pressure 25 cmH₂O

	Flexion	Extension	Rotation
HVLP	10.3 [8.5–13.1]	5.0 [2.7–7.0]	−0.1 [−0.4–0.5]
Taper	4 [2.6–5.3]	0.5 [−0.4–1.4]	0.1 [−1.0–0.9]
P value	<0.001∗	<0.001∗	0.91